I definitely like the Gen 2 Pro Mags, I was pissed when the first three Gen 1's had the follower problems. I talked to Pro Mag and they exchanged them for Gen 2's, they function flawlessly in my S-12. I would feel perfectly comfortable with a room full of Zombies and 10 loaded Gen 2 Pro Mags(00 of course) Clean up on aisle 3!!!